The iOS Jailbreak Hacker DevTeams advised the users on the launch of the iOS 5.1 back in the start of this month, not to update their locked iPhone devices to this firmware version until they won’t publish any new tool to bypass the Apple’s security and bring the carrier unlocking on the latest iOS firmware version, but still it is reported that number of unlucky users updated their iPhone 4S / 4 to iOS 5.1 and losses the iPhone 4S / 4 baseband Unlock on iOS 5.1.

It was especially advised to iPhone 4S / 4 users who have been running their applications using the old software or hardware-based exploits to bring unlock system on their devices, but some users sadly updated their devices mistakenly, and now using the devices on the new-generation basebands without unlock solution. However, it is now reported that user over the R-SIM aka REBEL SIM has got their hands on the new kind of exploit that allows them to expand their network on the iPhone 4S devices with bringing unlock solution for another baseband build.

There are currently the number of SIM Interposers are available in the market with unlocking solution tricks for the iPhone 4S, as the earlier three basebands of the iPhone 4S had been recently exploited by the users over this hardware based unlocking solution developer’s lab, and now they are focusing on the new baseband build unlocking solution for both iPhone 4 and iPhone 4S. The team behind the R-SIM had totally launched three different models of their SIM interposer, as the first R-SIM I come with a lot of complex procedure of bringing unlock on the iPhone 4S, and then the developers released R-SIM II that features less complex procedure to unlock the iPhone 4S on the latest iOS firmware version.

Now after the two versions released with same baseband capabilities, the team has launched the R-SIM III with the new baseband support of the iPhone 4S. R-SIM III allow you to unlock your iPhone 4S baseband 2.0.10 on iOS 5.1, yes they finally made their way to unlock the iPhone 4S as well on the iOS 5.1. So if you are one of those who have been using its device on older generation iOS firmware version, just to carry the unlock solution can now update to the new iOS 5.1 with baseband 2.0.10 on iPhone 4S, and can unlock its iPhone 4S on iOS 5.1 running baseband build 2.0.10.

In addition to the iPhone 4S new baseband 2.0.10 unlock on iOS 5.1, the developer has upgraded their SIM interposer with additional features and much-improved technology that consumes less power than the older R-SIM versions. Moreover, the new R-SIM doesn’t require you to dial any international help number in order to execute its unlocking solution, there is an automatic iOS 5.1 Baseband unlock solution for iPhone 4S with R-SIM 3.